<template>
  <div>
    <Breadcrumb :bread-item-name="['商品管理','商品分类']"></Breadcrumb>
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <tree-table
          class="treeTable"
          :data="catelist" :columns="columns" :selection-type="false"
          :expand-type="false" show-index index-text="#" border :show-row-hover="false"
      >
        <!--        是否有效模板-->
        <template slot="isOk" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted===false"
             style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else
             style="color: red"
          ></i>
        </template>
        <!--        排序模板-->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag size="mini" v-else-if="scope.row.cat_level===1" type="success">二级</el-tag>
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <!--      操作模板-->
        <template slot="opt" slot-scope>
          <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
          <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>
      <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="queryInfo.pagenum"
          :page-sizes="[3, 6, 9]"
          :page-size="queryInfo.pagesize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
      </el-pagination>
    </el-card>
    <!--    添加分类对话框-->
    <el-dialog
        title="添加分类"
        :visible.sync="addCateDialogVisible"
        width="40%"
        @close="addCateDialogClosed"
    >
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <el-cascader
              v-model="selectedKeys"
              expand-trigger="hover"
              :props="cascaderProps"
              :options="parentCateList"
              @change="parentCateChanged" clearable change-on-select></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addCateDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCate">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
import Breadcrumb from '@/components/Breadcrumb'

export default {
  name: 'Cate',
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      catelist: [],
      total: 0,
      columns: [{
        label: '分类名称',
        prop: 'cat_name'
      }, {
        label: '是否有效',
        //表示将当前列定义为模板列
        type: 'template',
        template: 'isOk'
      }, {
        label: '排序',
        //表示将当前列定义为模板列
        type: 'template',
        template: 'order'
      }, {
        label: '操作',
        //表示将当前列定义为模板列
        type: 'template',
        template: 'opt'
      }],
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      //父级分类的列表
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //选中的父级分类id数组
      selectedKeys: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      let { data: res } = await this.$http.get('/categories', { params: this.queryInfo })
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.catelist = res.data.result
      this.total = res.data.total
    },
    //监听pagesize改变的事件
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    //  当前页码值发生改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    //  获取父级分类的数据列表
    async getParentCateList() {
      let { data: res } = await this.$http.get('/categories', { params: { type: 2 } })
      if (res.meta.status !== 200) return this.$message.error('获取数据失败')
      this.parentCateList = res.data
    },
    //选择项发生变化触发这个函数
    parentCateChanged() {
      //if selectedKeys length>0 prove choose parent classification
      if (this.selectedKeys.length > 0) {
        //父级分类的id
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        //else nothing choose parent classification
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        let {
          data: res
        } = await this.$http.post('/categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error('添加分类失败')
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.level = 0
      this.addCateForm.cat_pid = 0
    }
  },
  components: {
    Breadcrumb
  }
}
</script>

<style scoped>
  .treeTable {
    margin-top: 10px;
  }

  .el-cascader {
    width: 100%;
  }
</style>